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Date: Fri, 21 Jan 2011 09:45:47 +0200
From: Tatyana Brokhman <tlinder@...eaurora.org>
To: gregkh@...e.de
Cc: linux-arm-msm@...r.kernel.org,
Tatyana Brokhman <tlinder@...eaurora.org>,
linux-usb@...r.kernel.org (open list:USB GADGET/PERIPH...),
linux-kernel@...r.kernel.org (open list)
Subject: [RFC/PATCH 4/4] uasp: TASK MANAGEMENT IU handling infrastructure
This patch defines APIs for different TASK MANAGEMENT IUs implementation
Signed-off-by: Tatyana Brokhman <tlinder@...eaurora.org>
---
drivers/usb/gadget/uasp_tmiu.c | 219 ++++++++++++++++++++++++++++++++++++++++
1 files changed, 219 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/gadget/uasp_tmiu.c b/drivers/usb/gadget/uasp_tmiu.c
index 4e244ae..6733545 100644
--- a/drivers/usb/gadget/uasp_tmiu.c
+++ b/drivers/usb/gadget/uasp_tmiu.c
@@ -48,6 +48,194 @@ void fill_response_iu(struct uasp_dev *udev,
}
/**
+ * reset_lun() - performs RESET LUN TM FUNCTION IU.
+ * @udev: Programming view of UASP device.
+ * @curlun: Pointer to struct uasp_lun if the COMMAND IU to be performed is
+ * addressed to a valid LUN, 0 otherwise.
+ * @tmiu: TM FUNCTION IU to be processed.
+ *
+ * This function performs LUN reset. It aborts all of the given LUN pending
+ * commands.
+ */
+static void reset_lun(struct uasp_dev *udev,
+ struct uasp_lun *curlun,
+ struct tm_iu *tmiu)
+{
+ DBG(udev->ucommon->common, "%s() - Enter\n", __func__);
+}
+
+/**
+ * abort_task() - This function performs ABORT TASK TM FUNCTION IU.
+ * @udev: Programming view of UASP device.
+ * @curlun: Pointer to struct uasp_lun if the COMMAND IU to be performed is
+ * addressed to a valid LUN, 0 otherwise.
+ * @tmiu: TM FUNCTION IU to be processed.
+ *
+ * This function aborts the command with the same ip_tag as in the
+ * tmiu->task_tag. It's valid only for command that are handled by a specific
+ * LUN .
+ */
+static void abort_task(struct uasp_dev *udev,
+ struct uasp_lun *curlun,
+ struct tm_iu *tmiu)
+{
+ DBG(udev->ucommon->common, "%s() - Enter\n", __func__);
+}
+
+/**
+ * abort_task_set() - This function performs ABORT TASK SET TM FUNCTION IU.
+ * @udev: Programming view of UASP device.
+ * @curlun: Pointer to struct uasp_lun if the COMMAND IU to be performed is
+ * addressed to a valid LUN, 0 otherwise.
+ * @tmiu: TM FUNCTION IU to be processed.
+ *
+ * This function aborts all the commands pending for the specified LUN.
+ */
+static void abort_task_set(struct uasp_dev *udev,
+ struct uasp_lun *curlun,
+ struct tm_iu *tmiu)
+{
+ DBG(udev->ucommon->common, "%s() - Enter\n", __func__);
+}
+
+/**
+ * reset_nexus() - This function performs RESET NEXUS TM FUNCTION IU.
+ * @udev: Programming view of UASP device.
+ * @tmiu: TM FUNCTION IU to be processed.
+ */
+static void reset_nexus(struct uasp_dev *udev,
+ struct tm_iu *tmiu)
+{
+ DBG(udev->ucommon->common, "%s() - Enter\n", __func__);
+}
+
+/**
+ * query_unit_attention() - performs QUERY UNIT ATTENTION TM FUNCTION IU.
+ * @udev: Programming view of UASP device.
+ * @curlun: Pointer to struct uasp_lun if the COMMAND IU to be performed is
+ * addressed to a valid LUN, 0 otherwise.
+ * @tmiu: TM FUNCTION IU to be processed.
+ *
+ * This function is used to obtain a unit attention condition or a deferred
+ * error pending, if such exists, for the LUN on which the task management
+ * function was received.
+ */
+static void query_unit_attention(struct uasp_dev *udev,
+ struct uasp_lun *curlun,
+ struct tm_iu *tmiu)
+{
+ DBG(udev->ucommon->common, "%s() - Enter\n", __func__);
+}
+
+
+/**
+ * This function performs QUERY TASK TM FUNCTION IU.
+ * @udev: Programming view of UASP device.
+ * @curlun: Pointer to struct uasp_lun if the COMMAND IU to be performed is
+ * addressed to a valid LUN, 0 otherwise.
+ * @tmiu TM FUNCTION IU to be processed.
+ */
+static void query_task(struct uasp_dev *udev,
+ struct uasp_lun *curlun,
+ struct tm_iu *tmiu)
+{
+ DBG(udev->ucommon->common, "%s() - Enter\n", __func__);
+}
+
+/**
+ * This function performs QUERY TASK SET TM FUNCTION IU.
+ * @udev: Programming view of UASP device.
+ * @curlun: Pointer to struct uasp_lun if the COMMAND IU to be performed is
+ * addressed to a valid LUN, 0 otherwise.
+ * @tmiu TM FUNCTION IU to be processed.
+ */
+static void query_task_set(struct uasp_dev *udev,
+ struct uasp_lun *curlun,
+ struct tm_iu *tmiu)
+{
+ DBG(udev->ucommon->common, "%s() - Enter\n", __func__);
+}
+
+/**
+ * process_tmiu() - process a given TM FUNCTION IU.
+ * @udev: Programming view of UASP device.
+ * @curlun: Pointer to struct uasp_lun if the COMMAND IU to be performed is
+ * addressed to a valid LUN, 0 otherwise.
+ * @miu: TM FUNCTION IU to be processed.
+ */
+static void process_tmiu(struct uasp_dev *udev,
+ struct uasp_lun *curlun,
+ struct tm_iu *tmiu)
+{
+ struct response_iu *riu;
+ unsigned long flags;
+
+ switch (tmiu->tm_function) {
+ case TM_FUNCTION_ABORT_TASK:
+ abort_task(udev, curlun, tmiu);
+ break;
+
+ case TM_FUNCTION_ABORT_TASK_SET:
+ case TM_FUNCTION_CLEAR_TASK_SET:
+ abort_task_set(udev, curlun, tmiu);
+ break;
+
+ case TM_FUNCTION_RESET_LUN:
+ reset_lun(udev, curlun, tmiu);
+ break;
+
+ case TM_FUNCTION_IT_NEXUS_RESET:
+ reset_nexus(udev, tmiu);
+ break;
+
+ case TM_FUNCTION_QUERY_TASK:
+ query_task(udev, curlun, tmiu);
+ break;
+
+ case TM_FUNCTION_QUERY_TASK_SET:
+ query_task_set(udev, curlun, tmiu);
+ break;
+
+ case TM_FUNCTION_QUERY_ASYNC_EVENT:
+ query_unit_attention(udev, curlun, tmiu);
+ break;
+
+ default:
+ ERROR(udev->ucommon->common, "%s(): Unsupported tmiu = %x\n",
+ __func__, tmiu->tm_function);
+ riu = (struct response_iu *)tmiu->bh->inreq->buf;
+ fill_response_iu(udev, riu, IUGETW(tmiu->ip_tag), 0,
+ RESPONSE_TM_FUNCTION_NOT_SUPPORTED);
+
+ fill_usb_request(tmiu->bh->inreq, (void *)riu,
+ UASP_SIZEOF_RESPONSE_IU, 0,
+ (void *)tmiu, 0, IUGETW(tmiu->ip_tag),
+ status_complete);
+ tmiu->ep = udev->status;
+ break;
+ }
+
+ tmiu->state = COMMAND_STATE_STATUS;
+ if (usb_ep_queue(tmiu->ep, tmiu->bh->inreq, 0)) {
+ ERROR(udev->ucommon->common,
+ "%s()usb_ep_queue failed\n", __func__);
+ tmiu->state = COMMAND_STATE_FAILED;
+ } else {
+ if (curlun) {
+ spin_lock_irqsave(&(curlun->lock), flags);
+ curlun->active_requests++;
+ spin_unlock_irqrestore(&(curlun->lock), flags);
+ } else {
+ spin_lock_irqsave(&(udev->ucommon->common->lock),
+ flags);
+ udev->active_requests++;
+ spin_unlock_irqrestore(&(udev->ucommon->common->lock),
+ flags);
+ }
+ }
+}
+
+/**
* do_tmdiu() - processes the TM FUNCTION IUs from a given queue.
* @udev: Programming view of file storage gadget.
* @curlun: Pointer to struct uasp_lun if TM FUNCTION IUs from
@@ -57,5 +245,36 @@ void fill_response_iu(struct uasp_dev *udev,
*/
void do_tmiu(struct uasp_dev *udev, struct uasp_lun *curlun)
{
+ struct list_head *link;
+ struct tm_iu *tmiu, *tmp;
+ unsigned long flags;
+
DBG(udev->ucommon->common, "%s() - Enter\n", __func__);
+
+ /* Select the tm_func_queue from which tmius should be processed */
+ if (curlun)
+ link = &curlun->tm_func_queue;
+ else
+ link = &udev->tm_func_queue;
+
+ DBG(udev->ucommon->common, "%s() - Rolling over tmiu queue\n",
+ __func__);
+ list_for_each_entry_safe(tmiu, tmp, link, node) {
+ if (tmiu->state != COMMAND_STATE_IDLE)
+ continue;
+
+ /* Try to get buffer for tmiu provessing */
+ spin_lock_irqsave(&(udev->ucommon->common->lock), flags);
+ tmiu->bh = get_buffhd(udev->ucommon->common->buffhds);
+ spin_unlock_irqrestore(&(udev->ucommon->common->lock), flags);
+
+ if (!tmiu->bh) {
+ ERROR(udev->ucommon->common,
+ "%s() -Didnt manage to get buffers for tmiu!\n",
+ __func__);
+ continue;
+ }
+
+ process_tmiu(udev, curlun, tmiu);
+ }
}
--
1.6.3.3
--
Sent by a Consultant for Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum
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